US4498345A - Method for measuring saw blade flexure - Google Patents

Method for measuring saw blade flexure Download PDF

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Publication number
US4498345A
US4498345A US06432619 US43261982A US4498345A US 4498345 A US4498345 A US 4498345A US 06432619 US06432619 US 06432619 US 43261982 A US43261982 A US 43261982A US 4498345 A US4498345 A US 4498345A
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US
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Grant
Patent type
Prior art keywords
blade
saw blade
flexure
measuring
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06432619
Inventor
Lawrence D. Dyer
Anderson D. McGregor
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Texas Instruments Inc
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Texas Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
    • G01M5/00Investigating the elasticity of structures, e.g. deflection of bridges, air-craft wings
    • G01M5/0041Investigating the elasticity of structures, e.g. deflection of bridges, air-craft wings by determining deflection or stress
    • G01M5/005Investigating the elasticity of structures, e.g. deflection of bridges, air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00Accessories specially designed for sawing machines or sawing devices
    • B23D59/001Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • B23D59/002Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade for the position of the saw blade
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D5/00Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
    • B28D5/02Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills
    • B28D5/022Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills by cutting with discs or wheels
    • B28D5/028Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills by cutting with discs or wheels with a ring blade having an inside cutting edge
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/849With signal, scale, or indicator
    • Y10T83/853Indicates tool position
    • Y10T83/855Relative to another element

Abstract

A system for measuring the flexure of a saw blade in situ includes in one embodiment a non-contact displacement sensor and means for directing a fluid flow at the blade adjacent the sensor. The deflection of the blade by the fluid flow is detected by the sensor which generates a signal related to blade flexure. The system indicates when a saw blade is correctly tensioned or when retensioning is required.

Description

BACKGROUND OF THE INVENTION

This invention relates generally to semiconductor wafer processing and more particularly to the optimization of wafer sawing using an internal diameter saw blade.

In semiconductor wafer preparation the flatness, depth of damage and edge perfection of a wafer are dependent upon the degree to which the internal diameter saw blade follows an ideal plane as it traverses the wafer, and its freedom from out-of-plane vibration. To meet these requirements the saw blade must be kept under a constant, high tension. An improperly tensioned blade will produce bowed or otherwise defective wafers and the useful life of the blade will be diminished, because the blade becomes unstable with respect to deviation under the forces of cutting. Further, the blade becomes free to vibrate with a greater amplitude than a properly tensioned blade.

Methods and apparatus are known in the art for monitoring blade deviation or displacement from a steady-state position as it moves through a crystal. However, these systems do not indicate whether the blade requires retensioning or merely needs dressing. If the blade is dressed when retensioning was the proper course of action, the result will be lower wafer quality and yield.

It is known in the art to measure blade tension by applying a force to the blade rim through a force gauge or a balance arm in contact with the blade and then reading deflection with a dial indicator. This method, however, requires stopping the saw, assembly and calibration of sensitive, precision equipment, and numerous measurements by a skilled operator. This is both expensive and time consuming.

SUMMARY OF THE INVENTION

The present invention provides a rapid, non-contact system and method for measuring blade flexure, and thus blade tension, without demounting the blade and while the blade is rotating. One embodiment of the present invention comprises a non-contact displacement sensor positioned adjacent the cutting rim of the saw blade, and means for directing a fluid flow at the blade near the sensor location. The fluid flow, for example, pressurized air, causes the blade to deflect. The deflection of the blade from its normal or steady-state position is detected by the sensor which produces a signal responsive thereto corresponding to blade flexure. The measured flexure, when compared to the flexure of a properly tensioned blade, is used to indicate when retensioning is required.

It is therefore an object of the present invention to provide an improved system and method for measuring saw blade flexure.

Another object of this invention is to provide a rapid, non-contact system and method for measuring saw blade tension.

Yet another object of this invention is to provide a system and method for in situ measurement of saw blade flexure while the blade is rotating.

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as further objects and advantages thereof, will be best understood by reference to the following detailed description of an illustrative embodiment, when read in conjunction with the accompanying drawins in which like numerals represent like parts throughout the several views, and wherein:

FIG. 1 is a diagrammatic view of a portion of an internal diameter saw blade;

FIG. 2 is a partially schematic plan view of a system according to the present invention; and

FIG. 3 is an elevational view of the system of FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings, there is shown in FIG. 1 an internal diameter saw blade 10 for cutting wafers from a semiconductor crystal 12. The core 14 of a typical blade 10 has a thickness of about 4-5 mils. A cutting edge 16 on the inner portion of blade 10 has a thickness of about 10-11 mils and comprises, for example, diamond or other abrasive particles bonded to the blade. A properly tensioned and dressed blade 10 will cut a kerf slot 18 of about 12 mils as it passes through crystal 12. As blade 10 loses tension through normal usage, the flexure, i.e., the distance the blade deflects under a given force, increases and allows the blade to vibrate. It is apparent that as the lateral vibration amplitude increases the kerf slot 18 widens, which correspondingly decreases the yield or the number of wafers that can be cut from crystal 12.

FIGS. 2 and 3 show one embodiment of a system according to the present invention wherein air (indicated by arrow 19) from a pressurized supply (not shown) is controlled by a valve 20 which is conected to a nozzle 22. Nozzle 22 is positioned a fixed distance, for example 30-50 mils, from blade 10 by a support member 24. A displacement sensor 26 is mounted on support member 24 adjacent nozzle 22. The optimum spacing of sensor 26 and nozzle 22 from blade 10 varies according to the available air pressure, the nozzle 22 orifice, the sensitivity of sensor 26, and the blade 10 characteristics.

Sensor 26 is preferably a non-contact sensor that generates an electrical signal related to the lateral displacement of blade 10. This signal is coupled to a meter 28 or other suitable device to provide an indication of blade deflection. Such sensing and indicating devices are known in the art, for example, the "Dyna-Track" system manufactured by Silicon Technology Corporation. With the sensor 26 of this system spaced about 30-50 mils from blade 10, it has been found that at a pressure of about 60 pounds per square inch an air flow through a 60 mil nozzle deflects a typical blade approximately 0.5 mil when the blade is properly tensioned. This deflection is a measure of blade flexure and is inversely related to blade tension. As blade 10 loses tension through usage the flexure, and thus the measured deflection, will increase.

In a manual mode of operation an initial reference measurement is made after blade 10 has been tensioned by opening valve 20 and reading the deflection on meter 28. Subsequent measurements are made at periodic intervals and compared to the reference measurement. Retensioning is required when the measured deflection exceeds a predetermined value corresponding to the minimum permissible blade tension. The present system is also advantageously employed during the retensioning operation to determine when the proper tension settings are attained, for example, by obtaining a reading equal to the reference value.

It will be readily apparent to those skilled in the art that above described system may be automated by including means to initiate a measurement at periodic intervals. For example, valve 20 can be opened by a solenoid (not shown) coupled thereto responsive to a signal from a counter which increments after each saw operation. Blade 10 flexure would thus be automatically measured each time a preselected number of wafers are cut. Means may also be included to provide an alarm indication when the tension lower limit is exceeded, or to disable the saw until corrective action is taken.

The present invention therefore provides a system for rapidly measuring saw blade flexure while the blade is installed and rotating. The system may readily be automated for periodically measuring the blade flexure and providing an indication when the blade tension falls below acceptable limits.

While the present invention has been described and illustrated with respect to specific embodiments, it is to be understood that various modifications may be made without departing from the spirit and the scope of the invention.

Claims (1)

What is claimed is:
1. A method for measuring the flexure of an internal diameter saw blade suitable for slicing wafers from a semiconductor crystal, comprising the steps of:
positioning sensor means adjacent the cutting edge of the saw blade for generating an output signal proportional to the the displacement of the blade in a direction normal to the plane of the blade;
directing a stream of air at the saw blade adjacent the sensor, while the saw blade is rotating, to displace the blade from its steady state position;
measuring the deflection of the saw blade by measuring the change in the sensor output, wherein the flexure of the saw blade can be determined; and
periodically repeating said directing and measuring steps to determine whether the blade flexure falls within a predetermined limit.
US06432619 1982-10-04 1982-10-04 Method for measuring saw blade flexure Expired - Lifetime US4498345A (en)

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US06432619 US4498345A (en) 1982-10-04 1982-10-04 Method for measuring saw blade flexure

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US4498345A true US4498345A (en) 1985-02-12

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4971021A (en) * 1987-07-31 1990-11-20 Mitsubishi Kinzoku Kabushiki Kaisha Apparatus for cutting semiconductor crystal
WO1996013357A1 (en) * 1994-10-28 1996-05-09 Memc Electronic Materials, Inc. Method and apparatus for automated quality control in wafer slicing
EP0779647A1 (en) * 1995-12-15 1997-06-18 Wacker-Siltronic Gesellschaft für Halbleitermaterialien Aktiengesellschaft Method and apparatus for treatment of semiconductor material
US5908989A (en) * 1995-05-16 1999-06-01 Vollmer Werke Maschinenfabrik Gmbh Method and apparatuses for measuring and correcting the stress profile of saw blades
US6142046A (en) * 1996-08-06 2000-11-07 Cae Machinery Ltd. Knife projection sensing system
US6576531B2 (en) * 2001-08-24 2003-06-10 Micron Technology, Inc. Method for cutting semiconductor wafers
US20040012795A1 (en) * 2000-08-30 2004-01-22 Moore Scott E. Planarizing machines and control systems for mechanical and/or chemical-mechanical planarization of microelectronic substrates
US20040214509A1 (en) * 2003-04-28 2004-10-28 Elledge Jason B. Systems and methods for mechanical and/or chemical-mechanical polishing of microfeature workpieces
US20050020191A1 (en) * 2002-03-04 2005-01-27 Taylor Theodore M. Apparatus for planarizing microelectronic workpieces
US20050026545A1 (en) * 2003-03-03 2005-02-03 Elledge Jason B. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20050079804A1 (en) * 2003-10-09 2005-04-14 Taylor Theodore M. Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions
US20050090105A1 (en) * 2002-07-18 2005-04-28 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., Microelectronic workpieces
US20050202756A1 (en) * 2004-03-09 2005-09-15 Carter Moore Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US20050266773A1 (en) * 2000-06-07 2005-12-01 Micron Technology, Inc. Apparatuses and methods for in-situ optical endpointing on web-format planarizing machines in mechanical or chemical-mechanical planarization of microelectronic-device substrate assemblies
EP1609570A1 (en) * 2004-06-24 2005-12-28 Paper Converting Machine Company Italia S.p.A. Cutting blade control system, particulary for cutting-off machines for cutting logs of web material
US20070088258A1 (en) * 2005-10-13 2007-04-19 Tyco Healthcare Group, Lp Trocar anchor
CN105758631A (en) * 2016-04-29 2016-07-13 成都惠锋金刚石工具有限公司 Method for testing cutting performance of diamond saw blade
CN107443600A (en) * 2017-08-25 2017-12-08 芜湖长润特种铜线有限公司 Copper material cutting machining equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728223A (en) * 1952-05-24 1955-12-27 Champion Paper & Fibre Company Web tension measuring apparatus
US3538765A (en) * 1966-09-03 1970-11-10 Siegener Maschinenbau Gmbh Device for the determination of tensile forces occurring in thin cold rolled strip
US3599485A (en) * 1969-06-26 1971-08-17 Wolfgang Muhlberg Process for measurements of longitudinal stresses in metal bands under longitudinal tension
DE2045284A1 (en) * 1970-09-14 1972-03-16 Awe Technik Gmbh

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728223A (en) * 1952-05-24 1955-12-27 Champion Paper & Fibre Company Web tension measuring apparatus
US3538765A (en) * 1966-09-03 1970-11-10 Siegener Maschinenbau Gmbh Device for the determination of tensile forces occurring in thin cold rolled strip
US3599485A (en) * 1969-06-26 1971-08-17 Wolfgang Muhlberg Process for measurements of longitudinal stresses in metal bands under longitudinal tension
DE2045284A1 (en) * 1970-09-14 1972-03-16 Awe Technik Gmbh

Cited By (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4971021A (en) * 1987-07-31 1990-11-20 Mitsubishi Kinzoku Kabushiki Kaisha Apparatus for cutting semiconductor crystal
US5632666A (en) * 1994-10-28 1997-05-27 Memc Electronic Materials, Inc. Method and apparatus for automated quality control in wafer slicing
WO1996013357A1 (en) * 1994-10-28 1996-05-09 Memc Electronic Materials, Inc. Method and apparatus for automated quality control in wafer slicing
US5908989A (en) * 1995-05-16 1999-06-01 Vollmer Werke Maschinenfabrik Gmbh Method and apparatuses for measuring and correcting the stress profile of saw blades
EP0779647A1 (en) * 1995-12-15 1997-06-18 Wacker-Siltronic Gesellschaft für Halbleitermaterialien Aktiengesellschaft Method and apparatus for treatment of semiconductor material
US5741173A (en) * 1995-12-15 1998-04-21 Wacker Siltronic Gesellschaft Fur Halbleitermaterialien Ag Method and apparatus for machining semiconductor material
US6142046A (en) * 1996-08-06 2000-11-07 Cae Machinery Ltd. Knife projection sensing system
US6237455B1 (en) * 1996-08-06 2001-05-29 Cae Machinery Ltd. Knife projection sensing system
US7229338B2 (en) 2000-06-07 2007-06-12 Micron Technology, Inc. Apparatuses and methods for in-situ optical endpointing on web-format planarizing machines in mechanical or chemical-mechanical planarization of microelectronic-device substrate assemblies
US20050266773A1 (en) * 2000-06-07 2005-12-01 Micron Technology, Inc. Apparatuses and methods for in-situ optical endpointing on web-format planarizing machines in mechanical or chemical-mechanical planarization of microelectronic-device substrate assemblies
US6986700B2 (en) 2000-06-07 2006-01-17 Micron Technology, Inc. Apparatuses for in-situ optical endpointing on web-format planarizing machines in mechanical or chemical-mechanical planarization of microelectronic-device substrate assemblies
US20040012795A1 (en) * 2000-08-30 2004-01-22 Moore Scott E. Planarizing machines and control systems for mechanical and/or chemical-mechanical planarization of microelectronic substrates
US6922253B2 (en) 2000-08-30 2005-07-26 Micron Technology, Inc. Planarizing machines and control systems for mechanical and/or chemical-mechanical planarization of microelectronic substrates
US6576531B2 (en) * 2001-08-24 2003-06-10 Micron Technology, Inc. Method for cutting semiconductor wafers
US20050268763A1 (en) * 2001-08-24 2005-12-08 Peng Neo C Method and apparatus for cutting semiconductor wafers
US6939199B2 (en) 2001-08-24 2005-09-06 Micron Technology, Inc. Method and apparatus for cutting semiconductor wafers
US7018270B2 (en) 2001-08-24 2006-03-28 Micron Technology, Inc. Method and apparatus for cutting semiconductor wafers
US20030203538A1 (en) * 2001-08-24 2003-10-30 Peng Neo Chee Method and apparatus for cutting semiconductor wafers
US20050020191A1 (en) * 2002-03-04 2005-01-27 Taylor Theodore M. Apparatus for planarizing microelectronic workpieces
US20060030240A1 (en) * 2002-03-04 2006-02-09 Taylor Theodore M Method and apparatus for planarizing microelectronic workpieces
US7121921B2 (en) 2002-03-04 2006-10-17 Micron Technology, Inc. Methods for planarizing microelectronic workpieces
US6969306B2 (en) 2002-03-04 2005-11-29 Micron Technology, Inc. Apparatus for planarizing microelectronic workpieces
US7604527B2 (en) 2002-07-18 2009-10-20 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US7182669B2 (en) 2002-07-18 2007-02-27 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US7341502B2 (en) 2002-07-18 2008-03-11 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US20050090105A1 (en) * 2002-07-18 2005-04-28 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., Microelectronic workpieces
US7070478B2 (en) 2003-03-03 2006-07-04 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US7258596B2 (en) 2003-03-03 2007-08-21 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20050026546A1 (en) * 2003-03-03 2005-02-03 Elledge Jason B. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20060228995A1 (en) * 2003-03-03 2006-10-12 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US6872132B2 (en) 2003-03-03 2005-03-29 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20050032461A1 (en) * 2003-03-03 2005-02-10 Elledge Jason B. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US7033246B2 (en) 2003-03-03 2006-04-25 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US7033248B2 (en) 2003-03-03 2006-04-25 Micron Technology, Inc. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20050026545A1 (en) * 2003-03-03 2005-02-03 Elledge Jason B. Systems and methods for monitoring characteristics of a polishing pad used in polishing micro-device workpieces
US20040214509A1 (en) * 2003-04-28 2004-10-28 Elledge Jason B. Systems and methods for mechanical and/or chemical-mechanical polishing of microfeature workpieces
US7357695B2 (en) 2003-04-28 2008-04-15 Micron Technology, Inc. Systems and methods for mechanical and/or chemical-mechanical polishing of microfeature workpieces
US7131891B2 (en) 2003-04-28 2006-11-07 Micron Technology, Inc. Systems and methods for mechanical and/or chemical-mechanical polishing of microfeature workpieces
US20070004321A1 (en) * 2003-04-28 2007-01-04 Micron Technology, Inc. Systems and methods for mechanical and/or chemical-mechanical polishing of microfeature workpieces
US20050239382A1 (en) * 2003-10-09 2005-10-27 Micron Technology, Inc. Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions
US7223297B2 (en) 2003-10-09 2007-05-29 Micron Technology, Inc. Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions
US6939211B2 (en) 2003-10-09 2005-09-06 Micron Technology, Inc. Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions
US20050079804A1 (en) * 2003-10-09 2005-04-14 Taylor Theodore M. Planarizing solutions including abrasive elements, and methods for manufacturing and using such planarizing solutions
US7413500B2 (en) 2004-03-09 2008-08-19 Micron Technology, Inc. Methods for planarizing workpieces, e.g., microelectronic workpieces
US20070010168A1 (en) * 2004-03-09 2007-01-11 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US7416472B2 (en) 2004-03-09 2008-08-26 Micron Technology, Inc. Systems for planarizing workpieces, e.g., microelectronic workpieces
US20050202756A1 (en) * 2004-03-09 2005-09-15 Carter Moore Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US7086927B2 (en) 2004-03-09 2006-08-08 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US20070021263A1 (en) * 2004-03-09 2007-01-25 Micron Technology, Inc. Methods and systems for planarizing workpieces, e.g., microelectronic workpieces
US20050284277A1 (en) * 2004-06-24 2005-12-29 Sergio Casella Cutting blade control system and method, particularly for cutting-off machines for cutting logs of web material
EP1609570A1 (en) * 2004-06-24 2005-12-28 Paper Converting Machine Company Italia S.p.A. Cutting blade control system, particulary for cutting-off machines for cutting logs of web material
US8136434B2 (en) 2004-06-24 2012-03-20 Paper Converting Machine Company Italia Spa Cutting blade control system, particularly for cutting-off machines for cutting logs of web material
US9308663B2 (en) 2004-06-24 2016-04-12 Paper Converting Machine Company Italia Spa Method for cutting blade control system, particularly for cutting-off machines for cutting logs of web material
US20070088258A1 (en) * 2005-10-13 2007-04-19 Tyco Healthcare Group, Lp Trocar anchor
CN105758631A (en) * 2016-04-29 2016-07-13 成都惠锋金刚石工具有限公司 Method for testing cutting performance of diamond saw blade
CN107443600A (en) * 2017-08-25 2017-12-08 芜湖长润特种铜线有限公司 Copper material cutting machining equipment

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